Voltage-Adaptive SRAM Control Across Active, Retention, and Brownout Modes
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Solution Overview
Problem
Existing SRAM technologies consume excessive power, particularly in battery-powered and energy-harvesting devices, necessitating improved energy budget management.
Innovation Solution
A voltage-adaptive SRAM system with a memory controller that adjusts operation modes and voltage levels based on available power, incorporating features like brownout detection and retention switches to minimize energy consumption and data retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If SRAM operates in active mode with full power supply, then read-write operations are enabled with fast access, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic voltage adaptation by transitioning between multiple operation modes (active mode with high voltage for fast operations, retention mode with low voltage for data preservation, and brownout mode for power conservation). The memory controller dynamically adjusts voltage levels based on operational requirements, enabling the system to optimize between speed and power consumption in real-time.
Solution Approach 2:
The system employs periodic switching between different operation modes depending on operational needs. The memory controller periodically transitions between active mode (for read/write operations), retention mode (for data preservation with minimal power), and brownout mode (for extended power conservation), creating a periodic action pattern that balances performance and energy efficiency.
2Use of energy by moving object
If SRAM uses retention mode to conserve energy, then power consumption decreases, but data retention capability is compromised at very low voltages
Solution Approach 1:
The patent utilizes parameter changes by adjusting voltage levels to different operational thresholds. In retention mode, the system operates at reduced voltage levels that balance power conservation with adequate data retention capability. The memory controller monitors voltage parameters and adjusts operational parameters accordingly, changing the voltage threshold for data retention based on the specific retention mode requirements.
Solution Approach 2:
The memory controller incorporates feedback mechanisms to monitor voltage levels and operational status. This feedback enables the controller to adjust retention mode parameters dynamically, ensuring that data retention reliability is maintained even at reduced voltage levels. The feedback loop allows the system to adapt retention mode operation based on real-time voltage and operational conditions.
3Use of energy by moving object
If SRAM enters brownout mode to prevent inrush current, then power consumption is minimized, but current leakage may occur
Solution Approach 1:
The patent applies preliminary anti-action by implementing brownout mode detection and response mechanisms that prevent inrush current before it can cause harm. The memory controller monitors power supply conditions and preemptively enters brownout mode when voltage drops below thresholds, thereby preventing inrush current and associated current leakage issues before they occur.
Solution Approach 2:
The system employs beforehand cushioning by designing protective circuits and control mechanisms that cushion against the harmful effects of inrush current and voltage drops. The memory controller includes protective features that cushion the system during brownout conditions, preventing excessive current leakage and maintaining operational integrity during low-power states.
4Device complexity
If SRAM operates without voltage adaptation, then circuitry remains simple, but energy budget management becomes unmanageable for battery-powered devices
Solution Approach 1:
The patent implements universality by designing a multi-functional memory controller that handles multiple operation modes (active, retention, brownout) within a single integrated circuit. The memory controller performs diverse functions including voltage regulation, mode transition management, data retention control, and power consumption optimization, thereby managing energy budget requirements without proportionally increasing circuitry complexity.
Data Source
AI summary
According to a first aspect of the present disclosed subject matter, voltage-adaptive static random-access memory (SRAM) comprising: at least one-bit SRAM cell having address, data and control buses; and a memory controller configured to determine operation modes and control voltage to a power rail of the at least one-bit SRAM cell based on an operation mode of the operation modes.